problem using validwhen and radio button

can anyone pls help me with my problem here? I'm trying to validate a form using the validwhen in struts. I have a form to add a user which contains a radio button group. Whenever one of the radio button is selected the corresponding textbox should also be filled. I manage to make the validation work but it is now requiring the user to fill up both the radio button and the text box What I wanted is just if one radio button is selected one text box should also be filled.. please help........... validation.xml

snippet of Add.jsp

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